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merge busybox.c into applets.c

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This commit is contained in:
Denis Vlasenko 2007-04-09 03:05:48 +00:00
parent 786834bcee
commit 32b633aa3f
6 changed files with 200 additions and 210 deletions
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1
applets/Kbuild
View File

@ -6,7 +6,6 @@
obj-y:=
obj-y += applets.o
obj-y += busybox.o
# Generated file needs additional love

239
applets/applets.c
View File

@ -15,11 +15,6 @@
#include <assert.h>
#include "busybox.h"
#define PROTOTYPES
#include "applets.h"
#undef PROTOTYPES
/* Apparently uclibc defines __GLIBC__ (compat trick?). Oh well. */
#if ENABLE_STATIC && defined(__GLIBC__) && !defined(__UCLIBC__)
#warning Static linking against glibc produces buggy executables
@ -30,7 +25,14 @@
#warning from top-level Makefile and remove this warning.
#endif
/* Declare <applet>_main() */
#define PROTOTYPES
#include "applets.h"
#undef PROTOTYPES
#if ENABLE_SHOW_USAGE && !ENABLE_FEATURE_COMPRESS_USAGE
/* Define usage_messages[] */
static const char usage_messages[] =
#define MAKE_USAGE
#include "usage.h"
@ -39,24 +41,25 @@ static const char usage_messages[] =
#undef MAKE_USAGE
#else
#define usage_messages 0
#endif /* ENABLE_SHOW_USAGE */
#endif /* SHOW_USAGE */
#undef APPLET
#undef APPLET_NOUSAGE
#undef PROTOTYPES
/* Define struct BB_applet applets[] */
#include "applets.h"
static struct BB_applet *applet_using;
/* The -1 arises because of the {0,NULL,0,-1} entry. */
const unsigned short NUM_APPLETS = (sizeof(applets) / sizeof(struct BB_applet) - 1);
const unsigned short NUM_APPLETS = sizeof(applets) / sizeof(struct BB_applet) - 1;
static struct BB_applet *current_applet;
const char *applet_name ATTRIBUTE_EXTERNALLY_VISIBLE;
#ifdef BB_NOMMU
smallint re_execed;
#endif
#if ENABLE_FEATURE_SUID_CONFIG
#include <ctype.h>
/* applets [] is const, so we have to define this "override" structure */
/* applets[] is const, so we have to define this "override" structure */
static struct BB_suid_config
{
struct BB_applet *m_applet;
@ -68,7 +71,7 @@ static struct BB_suid_config
struct BB_suid_config *m_next;
} *suid_config;
static int suid_cfg_readable;
static smallint suid_cfg_readable;
/* check if u is member of group g */
static int ingroup(uid_t u, gid_t g)
@ -101,16 +104,13 @@ static char *get_trimmed_slice(char *s, char *e)
break;
}
}
e[1] = 0;
e[1] = '\0';
/* Next, advance past all leading space and return a ptr to the
* first non-space char; possibly the terminating nul. */
return skip_whitespace(s);
}
#define parse_error(x) do { errmsg = x; goto pe_label; } while(0)
/* Don't depend on the tools to combine strings. */
static const char config_file[] = "/etc/busybox.conf";
@ -121,12 +121,14 @@ static const char mode_chars[] = "Ssx-\0Ssx-\0Ttx-";
* necessary below. Also, we use unsigned short here to save some
* space even though these are really mode_t values. */
static const unsigned short mode_mask[] = {
/* SST sst xxx --- */
/* SST sst xxx --- */
S_ISUID, S_ISUID|S_IXUSR, S_IXUSR, 0, /* user */
S_ISGID, S_ISGID|S_IXGRP, S_IXGRP, 0, /* group */
0, S_IXOTH, S_IXOTH, 0 /* other */
};
#define parse_error(x) do { errmsg = x; goto pe_label; } while(0)
static void parse_config_file(void)
{
struct BB_suid_config *sct_head;
@ -155,7 +157,7 @@ static void parse_config_file(void)
sct_head = NULL;
section = lc = 0;
do {
while (1) {
s = buffer;
if (!fgets(s, sizeof(buffer), f)) { /* Are we done? */
@ -234,7 +236,7 @@ static void parse_config_file(void)
/* Ok, we have an applet name. Process the rhs if this
* applet is currently built in and ignore it otherwise.
* Note: This can hide config file bugs which only pop
* Note: this can hide config file bugs which only pop
* up when the busybox configuration is changed. */
applet = find_applet_by_name(s);
if (applet) {
@ -266,7 +268,7 @@ static void parse_config_file(void)
s = skip_whitespace(e);
/* Note: We require whitespace between the mode and the
/* Note: we require whitespace between the mode and the
* user/group info. */
if ((s == e) || !(e = strchr(s, '.'))) {
parse_error("<uid>.<gid>");
@ -308,7 +310,7 @@ static void parse_config_file(void)
parse_error("keyword outside section");
}
} while (1);
} /* while (1) */
pe_label:
fprintf(stderr, "Parse error in %s, line %d: %s\n",
@ -322,10 +324,10 @@ static void parse_config_file(void)
sct_head = sct;
}
}
#else
#define parse_config_file() ((void)0)
#endif /* CONFIG_FEATURE_SUID_CONFIG */
#endif /* FEATURE_SUID_CONFIG */
#if ENABLE_FEATURE_SUID
static void check_suid(struct BB_applet *applet)
@ -391,9 +393,8 @@ static void check_suid(struct BB_applet *applet)
}
}
#else
#define check_suid(x)
#endif /* CONFIG_FEATURE_SUID */
#define check_suid(x) ((void)0)
#endif /* FEATURE_SUID */
#if ENABLE_FEATURE_COMPRESS_USAGE
@ -409,6 +410,7 @@ static const char *unpack_usage_messages(void)
if (pipe(input) < 0 || pipe(output) < 0)
exit(1);
//TODO: not NOMMU friendly!
pid = fork();
switch (pid) {
case -1: /* error */
@ -438,10 +440,10 @@ static const char *unpack_usage_messages(void)
full_read(output[0], buf, SIZEOF_usage_messages);
return buf;
}
#else
#define unpack_usage_messages() usage_messages
#endif /* ENABLE_FEATURE_COMPRESS_USAGE */
#endif /* FEATURE_COMPRESS_USAGE */
void bb_show_usage(void)
{
@ -450,19 +452,23 @@ void bb_show_usage(void)
const char *usage_string = unpack_usage_messages();
int i;
for (i = applet_using - applets; i > 0;)
if (!*usage_string++) --i;
i = current_applet - applets;
while (i) {
while (*usage_string++) continue;
i--;
}
format_string = "%s\n\nUsage: %s %s\n\n";
if (*usage_string == '\b')
format_string = "%s\n\nNo help available.\n\n";
fprintf(stderr, format_string, bb_msg_full_version,
applet_using->name, usage_string);
applet_name, usage_string);
}
exit(xfunc_error_retval);
}
static int applet_name_compare(const void *name, const void *vapplet)
{
const struct BB_applet *applet = vapplet;
@ -472,25 +478,168 @@ static int applet_name_compare(const void *name, const void *vapplet)
struct BB_applet *find_applet_by_name(const char *name)
{
/* Do a binary search to find the applet entry given the name. */
return bsearch(name, applets, NUM_APPLETS, sizeof(struct BB_applet),
applet_name_compare);
}
#if ENABLE_FEATURE_INSTALLER
/*
* directory table
* this should be consistent w/ the enum, busybox.h::Location,
* or else...
*/
static const char usr_bin [] = "/usr/bin";
static const char usr_sbin[] = "/usr/sbin";
static const char *const install_dir[] = {
&usr_bin [8], /* "", equivalent to "/" for concat_path_file() */
&usr_bin [4], /* "/bin" */
&usr_sbin[4], /* "/sbin" */
usr_bin,
usr_sbin
};
/* create (sym)links for each applet */
static void install_links(const char *busybox, int use_symbolic_links)
{
int (*lf)(const char *, const char *) = link;
char *fpc;
int i;
int rc;
if (use_symbolic_links)
lf = symlink;
for (i = 0; applets[i].name != NULL; i++) {
fpc = concat_path_file(
install_dir[applets[i].location],
applets[i].name);
rc = lf(busybox, fpc);
if (rc != 0 && errno != EEXIST) {
bb_perror_msg("%s", fpc);
}
free(fpc);
}
}
#else
#define install_links(x,y) ((void)0)
#endif /* FEATURE_INSTALLER */
/* If we were called as "busybox..." */
static int busybox_main(int argc, char **argv)
{
if (ENABLE_FEATURE_INSTALLER && argc > 1 && !strcmp(argv[1], "--install")) {
int use_symbolic_links = 0;
char *busybox;
/* to use symlinks, or not to use symlinks... */
if (argc > 2)
if (strcmp(argv[2], "-s") == 0)
use_symbolic_links = 1;
/* link */
busybox = xmalloc_readlink_or_warn("/proc/self/exe");
if (!busybox)
return 1;
install_links(busybox, use_symbolic_links);
if (ENABLE_FEATURE_CLEAN_UP)
free(busybox);
return 0;
}
/* Deal with --help. Also print help when called with no arguments */
if (argc == 1 || !strcmp(argv[1], "--help") ) {
if (argc > 2) {
/* set name for proper "<name>: applet not found" */
applet_name = argv[2];
run_applet_by_name(applet_name, 2, argv);
} else {
const struct BB_applet *a;
int col, output_width;
output_width = 80 - sizeof("start-stop-daemon, ") - 8;
if (ENABLE_FEATURE_AUTOWIDTH) {
/* Obtain the terminal width. */
get_terminal_width_height(0, &output_width, NULL);
/* leading tab and room to wrap */
output_width -= sizeof("start-stop-daemon, ") + 8;
}
printf("%s\n"
"Copyright (C) 1998-2006  Erik Andersen, Rob Landley, and others.\n"
"Licensed under GPLv2.  See source distribution for full notice.\n"
"\n"
"Usage: busybox [function] [arguments]...\n"
" or: [function] [arguments]...\n"
"\n"
"\tBusyBox is a multi-call binary that combines many common Unix\n"
"\tutilities into a single executable. Most people will create a\n"
"\tlink to busybox for each function they wish to use and BusyBox\n"
"\twill act like whatever it was invoked as!\n"
"\nCurrently defined functions:\n", bb_msg_full_version);
col = 0;
a = applets;
while (a->name) {
col += printf("%s%s", (col ? ", " : "\t"), a->name);
a++;
if (col > output_width && a->name) {
puts(",");
col = 0;
}
}
puts("\n");
return 0;
}
} else run_applet_by_name(argv[1], argc - 1, argv + 1);
bb_error_msg_and_die("applet not found");
}
void run_applet_by_name(const char *name, int argc, char **argv)
{
if (ENABLE_FEATURE_SUID_CONFIG)
parse_config_file();
/* Do a binary search to find the applet entry given the name. */
applet_using = find_applet_by_name(name);
if (applet_using) {
applet_name = applet_using->name;
current_applet = find_applet_by_name(name);
if (current_applet) {
applet_name = current_applet->name;
if (argc == 2 && !strcmp(argv[1], "--help"))
bb_show_usage();
if (ENABLE_FEATURE_SUID)
check_suid(applet_using);
exit(applet_using->main(argc, argv));
check_suid(current_applet);
exit(current_applet->main(argc, argv));
}
if (!strncmp(name, "busybox", 7))
exit(busybox_main(argc, argv));
}
int main(int argc, char **argv)
{
const char *s;
applet_name = argv[0];
#ifdef BB_NOMMU
/* NOMMU re-exec trick sets high-order bit in first byte of name */
if (applet_name[0] & 0x80) {
re_execed = 1;
applet_name[0] &= 0x7f;
}
#endif
if (applet_name[0] == '-')
applet_name++;
s = strrchr(applet_name, '/');
if (s)
applet_name = s + 1;
if (ENABLE_FEATURE_SUID_CONFIG)
parse_config_file();
/* Set locale for everybody except 'init' */
if (ENABLE_LOCALE_SUPPORT && getpid() != 1)
setlocale(LC_ALL, "");
run_applet_by_name(applet_name, argc, argv);
bb_error_msg_and_die("applet not found");
}

158
applets/busybox.c
View File

@ -1,158 +0,0 @@
/* vi: set sw=4 ts=4: */
/*
* BusyBox' main applet dispatcher.
*
* Licensed under GPLv2, see file LICENSE in this tarball for details.
*/
#include "busybox.h"
const char *applet_name ATTRIBUTE_EXTERNALLY_VISIBLE;
#ifdef BB_NOMMU
smallint re_execed;
#endif
#ifdef CONFIG_FEATURE_INSTALLER
/*
* directory table
* this should be consistent w/ the enum, busybox.h::Location,
* or else...
*/
static const char usr_bin [] = "/usr/bin";
static const char usr_sbin[] = "/usr/sbin";
static const char* const install_dir[] = {
&usr_bin [8], /* "", equivalent to "/" for concat_path_file() */
&usr_bin [4], /* "/bin" */
&usr_sbin[4], /* "/sbin" */
usr_bin,
usr_sbin
};
/* abstract link() */
typedef int (*link_func)(const char *, const char *);
/* create (sym)links for each applet */
static void install_links(const char *busybox, int use_symbolic_links)
{
link_func lf = link;
char *fpc;
int i;
int rc;
if (use_symbolic_links)
lf = symlink;
for (i = 0; applets[i].name != NULL; i++) {
fpc = concat_path_file(
install_dir[applets[i].location],
applets[i].name);
rc = lf(busybox, fpc);
if (rc != 0 && errno != EEXIST) {
bb_perror_msg("%s", fpc);
}
free(fpc);
}
}
#else
#define install_links(x,y)
#endif /* CONFIG_FEATURE_INSTALLER */
int main(int argc, char **argv)
{
const char *s;
#ifdef BB_NOMMU
/* NOMMU re-exec trick sets high-order bit in first byte of name */
if (argv[0][0] & 0x80) {
re_execed = 1;
argv[0][0] &= 0x7f;
}
#endif
applet_name = argv[0];
if (*applet_name == '-')
applet_name++;
while ((s = strchr(applet_name, '/')))
applet_name = s + 1;
/* Set locale for everybody except 'init' */
if (ENABLE_LOCALE_SUPPORT && getpid() != 1)
setlocale(LC_ALL, "");
run_applet_by_name(applet_name, argc, argv);
bb_error_msg_and_die("applet not found");
}
int busybox_main(int argc, char **argv);
int busybox_main(int argc, char **argv)
{
/*
* This style of argument parsing doesn't scale well
* in the event that busybox starts wanting more --options.
* If someone has a cleaner approach, by all means implement it.
*/
if (ENABLE_FEATURE_INSTALLER && argc > 1 && !strcmp(argv[1], "--install")) {
int use_symbolic_links = 0;
char *busybox;
/* to use symlinks, or not to use symlinks... */
if (argc > 2)
if (strcmp(argv[2], "-s") == 0)
use_symbolic_links = 1;
/* link */
// XXX: FIXME: this is broken. Why not just use argv[0] ?
busybox = xmalloc_readlink_or_warn("/proc/self/exe");
if (!busybox)
return 1;
install_links(busybox, use_symbolic_links);
if (ENABLE_FEATURE_CLEAN_UP)
free(busybox);
return 0;
}
/* Deal with --help. (Also print help when called with no arguments) */
if (argc == 1 || !strcmp(argv[1], "--help") ) {
if (argc > 2) {
applet_name = argv[2];
run_applet_by_name(applet_name, 2, argv);
} else {
const struct BB_applet *a;
int col, output_width;
output_width = 80 - sizeof("start-stop-daemon, ") - 8;
if (ENABLE_FEATURE_AUTOWIDTH) {
/* Obtain the terminal width. */
get_terminal_width_height(0, &output_width, NULL);
/* leading tab and room to wrap */
output_width -= sizeof("start-stop-daemon, ") + 8;
}
printf("%s\n"
"Copyright (C) 1998-2006  Erik Andersen, Rob Landley, and others.\n"
"Licensed under GPLv2.  See source distribution for full notice.\n\n"
"Usage: busybox [function] [arguments]...\n"
" or: [function] [arguments]...\n\n"
"\tBusyBox is a multi-call binary that combines many common Unix\n"
"\tutilities into a single executable. Most people will create a\n"
"\tlink to busybox for each function they wish to use and BusyBox\n"
"\twill act like whatever it was invoked as!\n"
"\nCurrently defined functions:\n", bb_msg_full_version);
col = 0;
for (a = applets; a->name;) {
col += printf("%s%s", (col ? ", " : "\t"), a->name);
a++;
if (col > output_width && a->name) {
puts(",");
col = 0;
}
}
puts("\n");
return 0;
}
} else run_applet_by_name(argv[1], argc - 1, argv + 1);
bb_error_msg_and_die("applet not found");
}

8
include/applets.h
View File

@ -11,10 +11,6 @@
* file result in the listing remaining in ascii order. You have been warned.
*/
#undef APPLET
#undef APPLET_ODDNAME
#undef APPLET_NOUSAGE
/*
name - applet name as it is typed on command line
name2 - applet name, converted to C (ether-wake: name2 = ether_wake)
@ -352,3 +348,7 @@ USE_ZCIP(APPLET(zcip, _BB_DIR_SBIN, _BB_SUID_NEVER))
};
#endif
#undef APPLET
#undef APPLET_NOUSAGE
#undef APPLET_ODDNAME

3
include/busybox.h
View File

@ -31,8 +31,7 @@ struct BB_applet {
__extension__ enum SUIDRoot need_suid:4;
};
/* Defined in busybox.c and applet.c */
extern int busybox_main(int argc, char **argv);
/* Defined in applet.c */
extern const struct BB_applet applets[];
extern const unsigned short NUM_APPLETS;

1
include/libbb.h
View File

@ -663,6 +663,7 @@ const struct hwtype *get_hwntype(int type);
#ifndef BUILD_INDIVIDUAL
extern struct BB_applet *find_applet_by_name(const char *name);
/* Returns only if applet is not found. */
extern void run_applet_by_name(const char *name, int argc, char **argv);
#endif